Editing Pulse (signal processing) (section)

===Nyquist pulse===
A Nyquist pulse is one which meets the [[Nyquist ISI criterion]] and is important in data transmission. An example of a pulse which meets this condition is the [[sinc function]].  The sinc pulse is of some significance in signal-processing theory but cannot be produced by a real generator for reasons of causality.

In 2013, Nyquist pulses were produced in an effort to reduce the size of pulses in optical fibers, which enables them to be packed 10 times more closely together, yielding a corresponding 10-fold increase in bandwidth. The pulses were more than 99 percent perfect and were produced using a simple laser and modulator.<ref>{{cite web|author=Joel Detrow |url=http://www.gizmag.com/optical-fiber-throughput-breakthrough/30038/ |title=Pointy pulses improve optical fiber throughput by a factor of 10 |publisher=Gizmag.com |access-date=2013-12-06}}</ref><ref>{{Cite journal |last=Soto |first=Marcelo A. |last2=Alem |first2=Mehdi |last3=Amin Shoaie |first3=Mohammad |last4=Vedadi |first4=Armand |last5=Brès |first5=Camille-Sophie |last6=Thévenaz |first6=Luc |last7=Schneider |first7=Thomas |date=2013-12-04 |title=Optical sinc-shaped Nyquist pulses of exceptional quality |journal=[[Nature Communications]] |language=en |volume=4 |pages=2898 |doi=10.1038/ncomms3898 |issn=2041-1723 |pmc=3863974 |pmid=24301610}}</ref>